Charge solitons and their dynamical mass in onedimensional arrays of Josephson junctions
Abstract
We investigate charge transport in onedimensional arrays of Josephson junctions. In the interesting regime of “small charge solitons” (polarons), ΛE_{J}>E_{C}>E_{J}, where Λ is the (electrostatic) screening length, the charge dynamics are strongly influenced by the polaronic effects (i.e., by dressing of a Cooper pair by charge dipoles). In particular, the soliton’s mass in this regime scales approximately as E_{J}^{2}. We employ two theoretical techniques: the manybody tightbinding approach and the meanfield approach, and the results of the two approaches agree in the regime of “small charge solitons.” Renormalization of the soliton’s mass could be observed; for example, as enhancement of the persistent current in a ringshaped array.
 Publication:

Physical Review B
 Pub Date:
 February 2011
 DOI:
 10.1103/PhysRevB.83.064517
 arXiv:
 arXiv:1008.5123
 Bibcode:
 2011PhRvB..83f4517H
 Keywords:

 74.81.Fa;
 85.25.Cp;
 03.75.Lm;
 05.45.Yv;
 Josephson junction arrays and wire networks;
 Josephson devices;
 Tunneling Josephson effect BoseEinstein condensates in periodic potentials solitons vortices and topological excitations;
 Solitons;
 Condensed Matter  Superconductivity;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 10 pages, 10 figures